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High-Temperature Fasteners Suppliers in China - High Strength Solutions from Our Factory

Our high-temperature fasteners are engineered to withstand operating temperatures ranging from 400℃ to 1200℃, making them ideal for demanding applications. Unlike conventional stainless steel and alloy steel fasteners, which have a maximum operating temperature of 400℃, our specialized fasteners maintain their integrity and performance even under extreme conditions. As a leading supplier and factory in China, we ensure that our high-temperature fasteners undergo rigorous evaluation, addressing critical factors such as thermal expansion coefficients, corrosion resistance, mechanical properties at elevated temperatures, anti-loosening capabilities, and disassembly requirements. These fasteners are primarily used in various industries, including heat treatment equipment, steam turbines, engines, injection molding, and hot extrusion equipment, making them a reliable choice for high-performance applications.

Product Detail

Products Features

7709 steel is a high-performance alloy steel, also known as 21CrMoV5-7, and is widely used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts and nuts. The following is an in-depth introduction to the screws made of 1.7709 material:

⚗️ (1) Chemical Composition

It mainly consists of carbon (C: 0.17–0.25), silicon (Si: 0.15–0.35), manganese (Mn: 0.35–0.85), chromium (Cr: 1.20–1.50), molybdenum (Mo: 0.65–0.80), and vanadium (V: 0.25–0.35) and other elements. The reasonable proportion of these elements gives the steel excellent comprehensive properties.

🔩 (2) Mechanical Properties

In the heat-treated state, 1.7709 steel has high strength and good mechanical properties. Its yield strength (Rp0.2) can reach ≥550 MPa, tensile strength (PM) can reach ≥700 MPa, elongation (A) ≥16%, and reduction of area (A) ≥60%.

🌡️ (3) Heat Resistance

This material can still maintain good mechanical properties in high-temperature environments and is suitable for working conditions with temperatures exceeding 300°C.

Application

🔥 High-temperature high-strength fasteners (H-T H-S Fasteners) need to simultaneously meet requirements such as high-temperature strength, anti-rust property and corrosion resistance in extreme environments. Their core application fields are as follows:

✈️(1) Aerospace Field

Aerospace engine: The turbine blade fasteners are manufactured using nickel-based high-temperature alloys (such as GH4049), maintaining a tensile strength of ≥ 1000 MPa at 600–900℃, and achieving complex shape processing through die forging technology.

Spacecraft structure: Components used for connecting the combustion chamber of the rocket engine, must withstand instantaneous high temperatures (>1200℃) and vibration loads.
⚡(2) Energy and Power Industry

Nuclear power plant: The bolts of the reactor pressure vessel must meet a lasting strength of ≥ 95 MPa (at 700°C/100,000 hours), to prevent hydrogen embrittlement and stress corrosion cracking.

Gas turbine: High-temperature bolts (such as A286 alloy) are used to fix the turbine discs and must undergo creep limit tests (1% total deformation/1000 hours).
🏭(3) Petroleum Chemical Industry and Marine Engineering

Refining and processing unit: The bolts of the hydrogenation reactor need to be used for a long time under high temperature and high pressure (400℃/20MPa), and the material must pass the hydrogen-induced delayed fracture test.
🏗️(4) Commercial Installation

Mold manufacturing: The fastening components of composite material molds need to match a low thermal expansion coefficient (CTE ≤ 10⁻⁶/℃) to maintain dimensional stability.
🚗(5) Automobiles and Rail Transit

New energy vehicles: The motor shaft bolts are made of titanium alloy (such as TC4), with a tensile strength of up to 900 MPa and no magnetic interference. The tapping process needs to be optimized to reduce work hardening.

The Following Is the Main Types of High Temperature Fasteners

Digital Grade	Material	Executive Standard	Withstand Temperature
2.4851 / UNS N06601 / Alloy601	NiCr23Fe	DIN17742 / EN10095 / ASTM B166	1200℃
2.4633 / UNS N06025 / Alloy602	NiCr25FeALY	DIN EN 10302 / ASTM B166	1200℃
2.4851	NiCr23Fe	DIN EN10095	1200℃
2.4889	NiCr28FeSiCe	DIN EN10095	1170℃
1.4854	X6NiCrSiNCe35-25	DIN EN10095	1170℃
1.4762	X10CrAISi25	DIN EN10095	1150℃
2.4816 / UNS N06600 / Alloy600	NiCr15Fe	DIN17742 / EN10095 / ASTM B166	1150℃
1.4841 / AISI310S / AISI314	X15CrNiSi25-21	EN10095 / SEW470	1150℃
1.4762 / SICRO12	X10CrAISi25	EN10095 / SEW470	1150℃
2.4665 / UNS N06002 / Alloy X	NiCr19NbMo	ASTM B572	1100℃
2.4663 / UNS N06617 / Alloy617	NiCr23Co12Mo	ASTM B166	1100℃
1.4864 / Alloy330	X12NiCrSi36-16	EN10095 / SEW470	1100℃
1.4835 / Alloy253 MA	X9CrNiSiNCe21-11-2	EN10095	1100℃
1.4835	X9CrNiSiNCe21-11-2	DIN EN10095	1100℃
1.4877	X6NiCrNbCe32-27	DIN EN10095	1100℃
1.4872	X25CrMnNiN25-9-7	DIN EN10095	1100℃
1.4841	X15CrNiSi25-21	DIN EN10095	1100℃
2.4816	NiCr15Fe	DIN EN10095	1100℃
1.4749	X18CrN28	DIN EN10095	1100℃
1.4845 / AISI310 / AISI3105	X8CrNi25-21	EN10095 / SEW470 / ASTM A276	1050℃
1.4864	X12NiCrSi35-16	DIN EN10095	1050℃
1.4886	X10NiCrSi35-19	DIN EN10095	1050℃
1.4887	X10NiCrSiNb35-22	DIN EN10095	1050℃
1.4821	X15CrNiSi25-4	DIN EN10095	1050℃
1.4876	X10NiCrAITi32-21	DIN EN10095	1050℃
1.4818	X6CrNiSiNCe19-10	DIN EN10095	1050℃
1.4845	X8CrNi25-21	DIN EN10095	1000℃
1.4742	X10CrAISi18	DIN EN10095	1000℃
1.4828 / AISI3095	X15CrNiSi20-12	EN10095 / SEW470 / ASTM A276	1000℃
1.4742 / SICRO 10	X10CrAISi18	EN10095 / SEW470	1000℃
2.4634 / UNS N13021 / Alloy 105	NiCo20Cr15MoAITi	ASTM B637	950℃
1.4876H / Alloy800H	X10NiCrAITi32-20H	ASTM B408	950℃
2.4969 / UNS N07090 / Alloy90	NiCr20Co18Ti	DIN EN10302 / BS 2HR2	920℃
1.4876HT / Alloy 800HT	X10NiCrAITi32-20HT	ASTM B408	900℃
1.4878 / AISI 321H	X8CrNiTi18-10	EN10095 / SEW470	850℃
1.4724 / SICRO 9	X10CrAISi13	EN10095 / SEW470	850℃
1.4736	X3CrAITi18-2	DIN EN10095	850℃
1.4828	X15CrNiSi20-12	DIN EN10095	850℃
1.4833	X12CrNi23-13	DIN EN10095	850℃
2.4856	NiCr22Mo9Nb	DIN EN10095	850℃
1.4724	X10CrAISi13	DIN EN10095	850℃
1.4878	X8CrNiTi18-10	DIN EN10095	800℃
1.4713	X10CrAISi7	DIN EN10095	800℃
2.4952 / UNS N07080 / Alloy 80A	NiCr20TiAI	DIN EN10269 / ASTM B 637	800℃
1.4713 / SICRO 8	X10CrAISi7	EN10095 / SEW470	800℃
1.4981	X8CrNiMoNb16-16	—	750℃
2.4668 / UNS N07718 / Alloy 718	NiCr19Fe19Nb5Mo3	DIN EN 10269 / ASTM B637	700℃
1.4986wk	X7CrNiMoBNb16-16	DIN EN 10269/2	670℃
1.4980 / Alloy268 / 660A/B/C/D	X6NiCrTiMoVB25-15-2	DIN EN10269 / ASTM 453	650℃
2.4669	NiCr15Fe7TiAI	—	650℃
2.4952	NiCr20TiAI	—	600℃
1.4980	X6NiCrTiMoVB25-15-2	—	600℃
1.4982	X10CrNiMoMnNbVB15-10-1	—	600℃
1.4986	X7CrNiMoBNb16-16	DIN EN 10269	600℃
1.7233	42CrMo5-6	—	600℃
1.4923	X22CrMoV12-1	DIN EN 10269	600℃
1.4913	X19CrMoNbVN11-1	DIN EN 10269	600℃
1.7711	40CrMoV4-6	DIN EN 10269	550℃
1.7709	21CrMoV5-7	DIN EN 10269	550℃
1.7218	25CrMo4	DIN EN 10269	550℃
1.4562 / UNS N08031 / Alloy31	X1NiCrMoCu32-28-7	ASTM B581 / B649	550℃
1.7711	40CrMoV4-6	DIN EN 10269	550℃
1.4913	X19CrMoNbVN11-1	DIN EN 10269	550℃
1.4948	X6CrNi18-10	—	550℃
1.4429	X2CrNiMoN17-13-3	—	550℃
1.4401	X5CrNiMo17-12-2	—	500℃
1.4404	X2CrNiMo17-12-2	—	500℃
1.4303	X4CrNi18-12	DIN EN10269	500℃
1.4301	X4CrNi18-10	—	500℃
1.4307	X2CrNi18-9	—	500℃
1.7729	20CrMoVTiB4-10	—	500℃
1.7729	20CrMoVTiB4-10	DIN EN 10269	500℃
1.7225	42CrMO4	DIN EN 10269	500℃
2.4858 / UNS N08825 / Alloy825	NiCr21Mo	DIN17744 / 17752 / ASTM B425	450℃
2.4856 / UNS N06625 / Alloy625	NiCr22Mo9Nb	ASTM B446 / B564 / E112	450℃
2.4816 / UNS N06600 / Alloy600	NiCr15Fe	ASTM B 166	450℃
2.4605 / UNS N06059 / Alloy59	NiCr23Mo16AI	ASTM B574 / B564	450℃
2.4610 / UNS N06455 / Alloy C4	NiMo16Cr16Ti	ASTM B574 / B564	400℃
2.4602 / UNS N06022 / Alloy C22	NiCr21Mo14W	ASTM B574 / B564	400℃
1.4571 / AISI 316Ti	X6CrNiMoTi17-12-2	DIN EN 10088-3 / 10272	400℃
1.4541 / AISI 321	X6CrNiTi18-10	DIN EN 10088-3 / 10272	400℃
1.4539 / AISI 904L	X1NiCrMoCu25-20-5	DIN EN 10088-3 / 10272	400℃
1.4529 / Alloy926	X1NiCrMoCu25-20-7	DIN EN 10088-3 / 10272	400℃
1.4429 / AISI 316LN	X2CrNiMoN17-13-3	DIN EN 10269 / 10272	400℃
1.4404 / AISI 316L	X2CrNiMo17-12-2	DIN EN 10269 / 10272	400℃
1.4923	X22CrMoV12-1	DIN EN 10269	400℃
1.7225	42CrMo4	DIN EN 10269	400℃
1.7709	21CrMoV5-7	DIN EN 10269	400℃
1.7258	24CrMo5	—	400℃
1.7219	26CrMo4	—	400℃
1.7218	25CrMo4	DIN EN 10269	400℃
1.4571	X6CrNiMoTi17-12-2	—	400℃
1.739	X15CrMo5-1	—	400℃
1.1133	20Mn5	—	400℃

Frequently Asked Questions (FAQ)

❓What is 1.7709 steel (21CrMoV5-7) and what makes it suitable for high-temperature fasteners?

1.7709 steel, also known as 21CrMoV5-7, is a high-performance chromium-molybdenum-vanadium alloy steel. Its carefully balanced chemical composition — including chromium for oxidation resistance, molybdenum for high-temperature strength, and vanadium for grain refinement — gives it excellent mechanical properties and heat resistance, making it ideal for bolts and nuts used in elevated-temperature environments up to 550°C.

❓What are the key mechanical properties of 1.7709 (21CrMoV5-7) in the heat-treated state?

In the heat-treated state, 1.7709 steel offers a yield strength (Rp0.2) of ≥550 MPa, a tensile strength of ≥700 MPa, an elongation of ≥16%, and a reduction of area of ≥60%. These properties ensure reliable performance under high mechanical loads and thermal stress.

❓Which industries most commonly use high-temperature high-strength fasteners?

High-temperature high-strength fasteners are widely used across multiple critical industries, including aerospace (turbine blades, rocket combustion chambers), energy and power (nuclear reactors, gas turbines), petroleum and chemical processing (hydrogenation reactors), mold manufacturing, and automotive/rail transit (electric vehicle motor shafts). Each application demands specific material grades based on temperature range and load requirements.

❓What is the maximum operating temperature for nickel-based high-temperature alloy fasteners such as Alloy601 or Alloy602?

Nickel-based alloys such as 2.4851 (Alloy601, NiCr23Fe) and 2.4633 (Alloy602, NiCr25FeALY) can withstand temperatures up to 1200°C. These grades comply with standards including DIN17742, EN10095, and ASTM B166, making them the top choice for the most extreme thermal environments such as industrial furnaces and aerospace combustion systems.

❓How do I choose the right high-temperature fastener material for my application?

Selecting the right material depends on several key factors: the maximum operating temperature, required mechanical strength (yield and tensile), exposure to corrosive media or hydrogen environments, applicable industry standards (DIN EN, ASTM, etc.), and dimensional/thermal expansion requirements. For temperatures below 500°C, standard stainless steels (e.g., 1.4404, 1.4301) may suffice; for 550–700°C, alloy steels like 1.7709 or austenitic grades are preferred; and for temperatures above 900°C, nickel-based superalloys are required.

❓What executive standards are commonly used for high-temperature fasteners?

High-temperature fasteners are governed by a range of international standards depending on the material and application. The most commonly referenced standards include DIN EN 10269 (fastener materials for elevated temperatures), DIN EN 10095 (heat-resistant steels and nickel alloys), ASTM B166 / B637 / B408 (nickel alloy bars and forgings), and SEW 470 (heat-resistant steel specifications). Always verify the applicable standard with your engineering team or supplier to ensure compliance.